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Glossary of terms used on this site

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Term Definition
Valve

(See Control Valve Assembly.)

Valve Body

(Sliding-Stem Control Valve Terminology) The main pressure boundary of the valve that also provides the pipe connecting ends, the fluid flow passageway, and supports the seating surfaces and the valve closure member. Among the most common valve body constructions are: a) single-ported valve bodies having one port and one valve plug; b) double-ported valve bodies having two ports and one valve plug; c) two-way valve bodies having two flow connections, one inlet and one outlet; d) three-way valve bodies having three flow connections, two of which can be inlets with one outlet (for converging or mixing flows), or one inlet and two outlets (for diverging or diverting flows). The term valve body, or even just body, frequently is used in referring to the valve body together with its bonnet assembly and included trim parts. More properly, this group of components should be called the valve body assembly.

Valve Body Assembly (Commonly Valve Body

(Sliding-Stem Control Valve Terminology) An assembly of a valve, bonnet assembly, bottom flange (if used), and trim elements. The trim includes the closure member, which opens, closes, or partially obstructs one or more ports.

Valve Plug

(Sliding-Stem Control Valve Terminology) A term frequently interchanged with plug in reference to the closure member.

Valve Stem

(Sliding-Stem Control Valve Terminology) In a linear motion valve, the part that connects the actuator stem with the closure member.

Velocity loop

A feedback control loop in which the controlled parameter is motor velocity. Usually uses a tachometer for a feedback device.

Vena Contracta

(Control Valve Functions and Characteristics Terminology) The portion of a flow stream where fluid velocity is at its maximum and fluid static pressure and the cross-sectional area are at their minimum. In a control valve, the vena contracta normally occurs just downstream of the actual physical restriction.

Volume Booster

A stand-alone relay is often referred to as a volume booster or simply booster because it boosts, or amplifies, the volume of air supplied to the actuator. (See Relay.)

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